//https://www.nowcoder.com/practice/09fbfb16140b40499951f55113f2166c?tpId=46&tqId=29109&rp=1&ru=/ta/classic-code&qru=/ta/classic-code&difficulty=2&judgeStatus=&tags=/question-ranking

class Solution {
public:
    /**
     * 
     * @param x int整型 
     * @return int整型
     */
    int sqrt(int x) {
        if(x == 0)
…        return -1;
    }
};